Glenn

The Ohio Supercomputer Center's IBM Cluster 1350, named "Glenn", features AMD Opteron multi-core technologies. The system offers a peak performance of more than 54 trillion floating point operations per second and a variety of memory and processor configurations. The current Glenn Phase II components were installed and deployed in 2009, while the earlier phase of Glenn – now decommissioned – had been installed and deployed in 2007.

2014/07/12: 222 nodes of Glenn have been removed.
In preparation for the delivery and installation of 240 nodes for Ruby, we have removed 222 nodes of Glenn. This reduction in available compute is required in order to ensure we stay under power limits at the SOCC and are able to physically configure the space in advance of the delivery of new hardware.

Hardware

The current hardware configuration consists of the following:

436 System x3455 compute nodes

Dual socket, quad core 2.5 GHz Opterons

24 GB RAM

393 GB local disk space in /tmp

2 System x3755 login nodes

Quad socket quad core 2.4 GHz Opterons

64 GB RAM

Voltaire 20 Gbps PCI Express adapters

There are 36 GPU-capable nodes on Glenn, connected to 18 Quadro Plex S4's for a total of 72 CUDA-enabled graphics devices. Each node has access to two Quadro FX 5800-level graphics cards.

Queues and Reservations

Here are the queues available on Glenn. Please note that you will be routed to the appropriate queue based on your walltime and job size request.

Name

Nodes available

max walltime

max job size

notes

Serial

Available minus reservations

168 hours

1 node

Longserial

Available minus reservations

336 hours

1 node

Restricted access

Parallel

Available minus reservations

96 hours

256 nodes

Dedicated

Entire cluster

48 hours

436 nodes

Restricted access

"Available minus reservations" means all nodes in the cluster currently operational (this will fluctuate slightly), less the reservations listed below. To access one of the restricted queues, please contact OSC Help. Generally, access will only be granted to these queues if performance of the job cannot be improved, and job size cannot be reduced by splitting or checkpointing the job.

In addition, there are a few standing reservations.

Name

Times

Nodes Available

Max Walltime

Max job size

notes

Debug

8AM-6PM Weekdays

16

1 hour

16 nodes

For small interactive and test jobs.

GPU

ALL

32

336 hours

32 nodes

Small jobs not requiring GPUs from the serial and parallel queues will backfill on this reservation.

Occasionally, reservations will be created for specific projects that will not be reflected in these tables.